Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun tourmaline

1 sense of tourmaline

Sense 1
tourmaline -- (a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones)
       => transparent gem -- (a gemstone having the property of transmitting light without serious diffusion)
       => mineral -- (solid homogeneous inorganic substances occurring in nature having a definite chemical composition)